Plan Changing from Fiscal Year to Calendar Year

[FishOn]

I have a plan that is a profit sharing only plan that has a plan year end of 11/30 and corresponds to the Employer fiscal year.  However, the employer is changing to calendar and wants to change the plan year to calendar year.  There will be a short plan year from 12/1 to 12/31.  They do not was to make the discretionary profit sharing for the plan year ending 11/30 but would rather make the profit sharing for the entire calendar year.  I think filing deadline has fried my brain.  Is that possible? If so, what are the steps to make that happen?